AT24C16B-TH-B Equivalent & Substitute Parts

Part Overview

The AT24C16B-TH-B is a 16Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface with 1 MHz clock frequency and 550 ns access time in 8-TSSOP surface mount packaging. This part is currently obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within system designs. Substitute parts are selected based on matching memory capacity, interface protocol, package type, and electrical operating parameters.

Key Parameters

Parameter	AT24C16B-TH-B
Memory Size	16Kbit
Memory Organization	2K x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AT24C16B-TH-B are grouped based on the following critical parameters that determine functional compatibility:

Primary Matching Criteria:

Memory Size: 16Kbit (mandatory)
Memory Organization: 2K x 8 (mandatory)
Memory Interface: I2C (mandatory)
Package / Case: 8-TSSOP (mandatory)
Mounting Type: Surface Mount (mandatory)

Secondary Compatibility Parameters:

Clock Frequency: 1 MHz (primary part specification; 400 kHz alternatives operate at reduced speed but maintain I2C protocol compatibility)
Access Time: 550 ns (primary part); 900 ns or 450 ns alternatives acceptable within I2C timing constraints
Voltage Supply Range: Minimum 1.7V ~ 5.5V (compatible with primary part range)
Operating Temperature: -40°C ~ 85°C minimum (primary part range)
RoHS Status: ROHS3 Compliant (all substitutes meet this requirement)

Substitutes are divided into two functional groups: (1) Direct 1 MHz I2C equivalents maintaining identical clock frequency, and (2) 400 kHz I2C alternatives suitable for applications where reduced clock speed is acceptable.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	Product Status
AT24C16B-TH-B	Microchip Technology	16Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Obsolete
24AA16H-I/ST	Microchip Technology	16Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA16-E/ST	Microchip Technology	16Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
24AA16-I/ST	Microchip Technology	16Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
AT24CS16-XHM-T	Microchip Technology	16Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
BR24G16FVT-3AGE2	Rohm Semiconductor	16Kbit	1 MHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24G16FVT-3GE2	Rohm Semiconductor	16Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24L16FVT-WE2	Rohm Semiconductor	16Kbit	400 kHz	Not specified	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24T16FVT-WE2	Rohm Semiconductor	16Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
M24C16-DRDW3TP/K	STMicroelectronics	16Kbit	1 MHz	450 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
M24C16-DRDW8TP/K	STMicroelectronics	16Kbit	1 MHz	450 ns	1.7V ~ 5.5V	-40°C ~ 105°C	8-TSSOP	Active

Engineering Selection Recommendations

For Direct 1 MHz I2C Replacement (Identical Clock Frequency):

AT24CS16-XHM-T (Microchip Technology) is the primary active equivalent, maintaining 1 MHz clock frequency, 550 ns access time, and identical I2C protocol specifications. This part is actively manufactured and ROHS3 compliant. Packaging differs as Tape & Reel (TR) versus the original tube packaging, but component specifications remain functionally equivalent.

M24C16-DRDW3TP/K and M24C16-DRDW8TP/K (STMicroelectronics) provide 1 MHz I2C operation with improved 450 ns access time. Both parts carry AEC-Q100 automotive qualification and are actively produced. M24C16-DRDW3TP/K supports -40°C ~ 125°C operating range, while M24C16-DRDW8TP/K operates to -40°C ~ 105°C.

BR24G16FVT-3AGE2 (Rohm Semiconductor) offers 1 MHz I2C operation in active production status with extended voltage range (1.6V ~ 5.5V). Package variant is 8-TSSOP-B.

For 400 kHz I2C Operation (Reduced Clock Speed):

24AA16-E/ST (Microchip Technology) provides extended operating temperature range (-40°C ~ 125°C) with 400 kHz I2C operation. This part is actively manufactured and suitable for applications where reduced clock frequency is acceptable.

24AA16H-I/ST and 24AA16-I/ST (Microchip Technology) are active alternatives with 400 kHz I2C operation and standard -40°C ~ 85°C temperature range.

BR24G16FVT-3GE2, BR24L16FVT-WE2, and BR24T16FVT-WE2 (Rohm Semiconductor) provide 400 kHz I2C operation with active product status. BR24L16FVT-WE2 carries DiGi-Electronics Programmable verification.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part specifications. STMicroelectronics M24C16 variants include AEC-Q100 automotive qualification, suitable for automotive applications requiring enhanced reliability standards.

Frequently Asked Questions (FAQ)

Q: Can 400 kHz I2C parts replace the 1 MHz AT24C16B-TH-B?

A: Yes, 400 kHz I2C EEPROM parts are functionally compatible as substitutes. The I2C protocol operates at the lower clock frequency without loss of functionality. System timing must accommodate the reduced clock speed and longer access times (900 ns versus 550 ns). Applications with timing-critical I2C bus operations should verify compatibility before substitution.

Q: What is the difference between 8-TSSOP and 8-TSSOP-B packaging?

A: Both packages are 8-pin thin shrink small outline packages with identical 0.173" width and 4.40mm body dimensions. The -B variant indicates a package revision by the manufacturer. Pin configuration and PCB footprint remain compatible for board-level substitution.

Q: Are Rohm Semiconductor BR24 series parts pin-compatible with Microchip AT24 series?

A: Yes, all 16Kbit I2C EEPROM parts in 8-TSSOP packaging maintain identical pin configuration and I2C protocol compatibility. Electrical specifications differ slightly (voltage range, access time), but functional substitution is supported.

Q: Which substitute part offers the best performance match to AT24C16B-TH-B?

A: AT24CS16-XHM-T (Microchip Technology) provides the closest performance match with identical 1 MHz clock frequency and 550 ns access time. This part is actively manufactured and maintains all electrical specifications of the obsolete original.

Q: Can I use M24C16-DRDW3TP/K in automotive applications?

A: Yes, M24C16-DRDW3TP/K carries AEC-Q100 automotive qualification and supports extended temperature range (-40°C ~ 125°C), making it suitable for automotive EEPROM applications requiring enhanced reliability standards.

Q: What inventory availability should I expect for substitute parts?

A: Active substitute parts show substantial inventory levels. BR24G16FVT-3GE2 has 29,400 pcs in stock. M24C16-DRDW3TP/K has 303,356 pcs available. Microchip 24AA16 variants maintain 1,700+ pcs inventory. Specific availability should be confirmed with component distributors.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the original AT24C16B-TH-B specifications.

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